Static electric and magnetic fields

Static electric and magnetic fields do not change over time and are created by stationary charges and currents. Hence, they have a frequency of 0 Hz. There are both natural and man-made sources of static fields.

Static 

Electric & Magnetic 

Fields

Static electric fields, also known as electrostatic fields, are created by charges that are fixed in space. The best known and most powerful display of electric static fields occur in nature as lightning. Static shocks, such as those created due to friction with clothes and other materials, are also common and trivial events caused by electrostatic fields. 

Static magnetic fields are created by magnets or charges that move at a steady flow (current), such as in direct current (DC) electricity. They exert an attracting force on metallic objects, and so magnets are commonly used for this purpose. In nature, the geomagnetic field of the Earth exerts a force from south to north that allows, for example, the operation of a compass or the location of the Earth’s magnetic Poles. Much stronger fields are generated by some types of industrial and medical equipment, such as magnetic resonance imaging (MRI) devices, used for medical diagnosis. This table describes the field intensity or level associated with some common sources of static electric and magnetic fields.